| /** |
| * @file |
| * This is the IPv4 address tools implementation. |
| * |
| */ |
| |
| /* |
| * Copyright (c) 2001-2004 Swedish Institute of Computer Science. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without modification, |
| * are permitted provided that the following conditions are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright notice, |
| * this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright notice, |
| * this list of conditions and the following disclaimer in the documentation |
| * and/or other materials provided with the distribution. |
| * 3. The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT |
| * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT |
| * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
| * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY |
| * OF SUCH DAMAGE. |
| * |
| * This file is part of the lwIP TCP/IP stack. |
| * |
| * Author: Adam Dunkels <adam@sics.se> |
| * |
| */ |
| |
| #include "lwip/opt.h" |
| #include "lwip/ip_addr.h" |
| #include "lwip/inet.h" |
| #include "lwip/netif.h" |
| |
| #define IP_ADDR_ANY_VALUE 0x00000000UL |
| #define IP_ADDR_BROADCAST_VALUE 0xffffffffUL |
| |
| /* used by IP_ADDR_ANY and IP_ADDR_BROADCAST in ip_addr.h */ |
| const struct ip_addr ip_addr_any = { IP_ADDR_ANY_VALUE }; |
| const struct ip_addr ip_addr_broadcast = { IP_ADDR_BROADCAST_VALUE }; |
| |
| /** |
| * Determine if an address is a broadcast address on a network interface |
| * |
| * @param addr address to be checked |
| * @param netif the network interface against which the address is checked |
| * @return returns non-zero if the address is a broadcast address |
| */ |
| u8_t ip_addr_isbroadcast(struct ip_addr *addr, struct netif *netif) |
| { |
| u32_t addr2test; |
| |
| addr2test = addr->addr; |
| /* all ones (broadcast) or all zeroes (old skool broadcast) */ |
| if ((~addr2test == IP_ADDR_ANY_VALUE) || |
| (addr2test == IP_ADDR_ANY_VALUE)) |
| return 1; |
| /* no broadcast support on this network interface? */ |
| else if ((netif->flags & NETIF_FLAG_BROADCAST) == 0) |
| /* the given address cannot be a broadcast address |
| * nor can we check against any broadcast addresses */ |
| return 0; |
| /* address matches network interface address exactly? => no broadcast */ |
| else if (addr2test == netif->ip_addr.addr) |
| return 0; |
| /* on the same (sub) network... */ |
| else if (ip_addr_netcmp(addr, &(netif->ip_addr), &(netif->netmask)) |
| /* ...and host identifier bits are all ones? =>... */ |
| && ((addr2test & ~netif->netmask.addr) == |
| (IP_ADDR_BROADCAST_VALUE & ~netif->netmask.addr))) |
| /* => network broadcast address */ |
| return 1; |
| else |
| return 0; |
| } |